Sabotage showed the barrier's bounds were unguarded: making the
timeout/unsupported-method fallback never settle, or lifting the 10s
replay deadline, left every suite green, as did deleting the pre-read
barrier await in reconcileActiveTranscript.
Restore Bear's original timeout/unsupported it.each from 8ee10f65931
(both must resolve true and release parked frames within the bound), and
add one reconcileActiveTranscript case proving a background refresh does
not read REST until the reconnect replay has dispatched.
716db852fe